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Roomba virtualwall demo

by Dorty, published

Roomba virtualwall demo by Dorty Feb 17, 2013


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3542Views 649Downloads Found in Robotics


I have two of those clean robots from iRobot ... and just for fun i dicided to build my own virtual-wall clone .. well they are quite cheap on ebay so there's no real reason for that except hobby ;-)


Print it and attach your electronics to it.

a sample circuit is attached ... it can produce any signal you like ...
also some sample code .. producing Roomba signals ...
the code is from "http://adrianlombard.wordpress.com/2009/01/18/arduino-irobot-infrared-communication/" .. i just changed a few things ...

please note: if you use a attiny85 .. you have to "burn the Bootloader" in the arduino-ide to get it running at 8 mhz ... by default it is running at 1 mhz ... well a arduino is running at 16mhz so you have to divide all timings by 2 ... thats the reason why:
const int PULSE_WIDTH = 5; // time between pulses, in microseconds
is 5µs instead of 10µs ...

so everything is said .. except .. the MC7805CT supports input-voltages from 5v to 18v ... i use a 9v-block battery to powerup the virtual-wall.

!!! UPDATE !!! -= Please not a build another one .. and that wasn't running ... i triggered out that the 330 Ohm resistor is to low for the IR-Diode and the Current will block the ATTiny ... just us a higher Resistor ... at the moment i use 2*330R .. =- !!! UPDATE !!!

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Just bought a Roomba, so I like this thing..

I have one question though... How long does it run on a 9v battery? As far as I can figure, it wont be much more than 10days, probably less when using a linear regulator...

Well .. after 4 years i dont really remember the maths i did .. but it should run 10~20 Days i guess ..
well you could replace the linear-regulator with a voltage-divider ... remove the optical-led .. an get more runtime from it ...
for testing around i use linear-regulators .. so i can plug in any voltage-supply in my test-circuits
i hate using 9v batteries the are having a really low capacity ... 1,5V A are way better at this but you need a battery-holder-block-thingy ...

after all, i always switched of all of the turrets after using them, the battery lastet for a long time ^.^' but yes the original turrets consume less power. :-)
you can surly optimize the circuit ..